Bingo! I have been complaining about this for a while. If a white person had taken a long-standing black person's role we would be having non-stop articles about "cultural appropriation". When it's the other way around, we get articles about how brave and wonderful this is.
If you want to have a super hero who is black, write your own damn story. Don't draft on a story or character that has, since inception, been white. Well, actually an alien.
I thought Black Panther was an okay movie, just okay; but, it didn't deserve all of the accolades that it got. However, I liked that they made a story of their own. (In my defense on Black Panther only being an okay movie, the Rotten Tomatoes score seems to also think this as there is a 20 point difference between what the critics thought (Oprah: It's not a movie, its a revelation.) and what the audience thought about it.)
Hell, when a Semitic (true Middle Eastern) woman plays a true Middle Eastern (Egyptian) queen of Greek-Semitic ancestry, the “blacks” get jealous and racially angry that a Nubian was not selected!